Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8ad425870eb3e1…

MALICIOUS

PDF

39.2 KB Created: 2020-08-14 16:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2da63dd7d6fe8d4d9d0f4d6a9b99676 SHA-1: 24b456bb741c0deabed1aac3d5b8bbb33b46512a SHA-256: 3f8ad425870eb3e1b113d3bcd232cc5800bdcde54bee97b31d1725c838a61ded
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=hamburg+ny+weather+report' which is flagged as malicious. The presence of numerous other links, many hosted on Shopify, suggests a link farm designed to obscure the true malicious destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=hamburg+ny+weather+report
    • http://files.nhgahplgs.com/uploads/1/3/0/7/130775432/muzisisakate_gojuw.pdf
    • http://files.41studiosdesign.com/uploads/1/3/0/7/130775046/gopodenu_ludoped.pdf
    • http://files.tarinarosesocialmedia.com/uploads/1/3/1/3/131379732/bcb6e7d3623f9.pdf
    • http://files.choosejoyanyway.org/uploads/1/3/0/8/130873732/d9d632d.pdf
    • http://files.agelessumedspa.net/uploads/1/3/1/8/131856706/jegolemepa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45484104345.pdf
    • https://cdn.shopify.com/s/files/1/0428/2230/3911/files/fomak.pdf
    • https://cdn.shopify.com/s/files/1/0428/0687/0183/files/75100422316.pdf
    • https://cdn.shopify.com/s/files/1/0437/6962/6781/files/tomuzisiwetiriki.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/82751653843.pdf
    • https://cdn.shopify.com/s/files/1/0434/4990/9415/files/64065925005.pdf
    • https://cdn.shopify.com/s/files/1/0432/3731/0626/files/wobibesilufumobemegedozu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9833/files/fefaranavuvivu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3175/5932/files/21946335971.pdf
    • https://cdn.shopify.com/s/files/1/0437/5861/6733/files/leroregegotilep.pdf
    • https://cdn.shopify.com/s/files/1/0433/3253/4440/files/tekatozarelewadazofa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bc7.bin
87f8d177e39f5a1405d2e7ba6e3e7c1aee3e91e58bdd5f6ac98519dff701b29c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC7 5316 bytes
font_01_sfnt_off00006dc0.bin
971bbbb8647b2fa83a6bdcea8e26f98f4e9b40cafc98652ca533d51edf906e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC0 10072 bytes

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